The only reason not to use sRGB is if the captured image has printable colors outside of sRGB. Most images don't. Those do not benefit from the larger gamut working spaces.

I have a wide gamut monitor but usually work in monitor sRGB. My monitor, an EIZO 301W, has been profiled for "native" and sRGB emulation. I only switch to "native" when I need to work in a larger space because the image contains colors outside sRGB. The rest of the time I prefer to just leave the monitor on sRGB emulation as the colors for all my other apps and desktop are too saturated otherwise. Of course Photoshop displays these images the same whether sRGB or native as there is nothing to gain when the images are inside sRGB.